Revenue
The amount invoiced or taken from the customer, normally excluding VAT for management calculations. Revenue is useful, but it is not the amount you can safely spend to acquire another customer.
Review growth guide
How to Calculate the Value of One Extra Local Customer
A practical UK guide to working out what one additional local customer is really worth, using contribution, repeat custom, referrals and acquisition cost.
Local growth maths
Turn one additional customer into a sensible growth budget
The value of one extra local customer is not simply the price on their first invoice. For a local business, the useful figure is the profit contribution that customer is expected to create after direct costs, follow-up costs and the cost of winning them. In many cases, it should also account for realistic repeat work and measurable referrals.
Once you know that number, decisions become clearer. You can set a sensible ceiling for paid lead generation, judge whether a promotion is worthwhile, prioritise the services worth marketing and put review activity in commercial context. This guide shows how to calculate it without pretending that every enquiry, review or click will become a sale.
Start with the right definition of customer value
Businesses often use the phrase customer lifetime value to mean several different things. That is risky because a £300 sale, £300 gross profit and £300 cash received are not interchangeable. For practical local-business decisions, calculate a contribution-based customer value: the expected money left to help cover overheads and profit after costs that genuinely increase when you serve that customer.
Gross contribution
Revenue minus direct, variable costs of doing that work. These might include materials, delivery, card fees, sales commission, mileage, disposal charges, subcontractor costs and genuinely variable labour.
Customer value after acquisition
Expected gross contribution across the relationship, less the attributable cost of winning and onboarding that customer. This is the most useful figure for setting marketing limits.
| Include when it changes because of this customer | Usually treat separately as fixed overhead |
|---|---|
| Parts and consumables | Premises rent |
| Payment processing charges | Core salaried management team |
| Job-specific subcontractors | Insurance and accountancy fees |
| Extra mileage, parking and disposal | Normal software subscriptions |
| Sales commission or marketplace fees | General advertising not tied to a customer |
| Overtime or extra capacity needed for the job | Normal equipment depreciation |
This distinction is not an accounting rule for every situation; it is a decision-making tool. If your technician is already on payroll and has an empty afternoon, their normal salary may be fixed in the short term. If you must pay overtime, bring in a subcontractor or turn away better work, the additional cost is very real and belongs in the calculation.
Do not mistake turnover for customer value
A £1,000 job with £820 of direct costs is not worth £1,000 to your growth budget. It creates £180 of contribution before acquisition cost and fixed overheads. Spending £250 to win it would not make commercial sense unless there is well-supported future value that changes the calculation.
The core formula for one extra local customer
Use the simplest reliable version first. You can make it more sophisticated later, once you have better records.
First-sale contribution = sale value excluding VAT − direct variable costs
Expected customer value before acquisition = first-sale contribution + expected repeat contribution + expected referral contribution
Value of one extra customer after acquisition = expected customer value before acquisition − acquisition and customer-specific follow-up costs
Expected means probability-weighted, not hoped-for. If 30% of customers buy a second service that produces £100 of contribution, the expected repeat contribution is £30, not £100. This small discipline is what keeps the number useful.
A quick first-sale calculation
Imagine a local electrician completes a call-out and repair for £260 excluding VAT. Materials cost £55, a variable technician payment is £70, and card charges, parking and disposal total £14.
£260 − £55 − £70 − £14 = £121 first-sale contribution
That £121 is not final profit: it still helps pay for premises, vehicles, insurance, administration, tax and owner drawings. But it is the relevant starting point for deciding how much it was rational to spend to create that booked job.
Add repeat work carefully
Suppose the electrician’s records show that 30% of first-time repair customers purchase a further job within the next 24 months. The average later job produces £105 of contribution.
30% × £105 = £31.50 expected repeat contribution
The running expected value is now £152.50. Use your own booking, invoicing or point-of-sale history where possible. If you cannot yet see repeat buying clearly, leave it out rather than inserting an optimistic guess.
Add referrals only when they are recorded
Referrals can be valuable, especially for trades, clinics, tutors, beauty businesses and specialist local services. They are also easy to overstate. Ask every new customer how they heard about you and use a distinct referral option in your records. If 12% of new customers historically lead to one referred job with an average contribution of £110, the expected referral contribution is £13.20.
12% × £110 = £13.20 expected referral contribution
The electrician’s estimated value before acquisition is therefore £165.70: £121 + £31.50 + £13.20. If the paid lead, call handling and customer-specific follow-up totalled £35, the value after acquisition would be £130.70.
Keep referral value separate at first. It is useful for longer-term planning, but it should not be the only reason a first sale appears viable. For cash-sensitive decisions, work from first-sale contribution or first-sale-plus-repeat contribution, then treat referrals as upside until your records prove otherwise.
Calculate it in six practical steps
- 1
Choose the customer type and time period
Do not average every customer together if their economics differ sharply. A boiler installation, emergency repair and annual service customer should usually have separate values. Choose a realistic period such as the first sale, 12 months or 24 months. A longer window is only helpful if you can support it with evidence.
- 2
Find the average sale excluding VAT and refunds
Use completed, paid work rather than quotes. Remove VAT from the calculation, deduct discounts and account for refunds, bad debt or cancellations where they are a meaningful feature of the business. A rolling six- or 12-month average is often enough for a small business with a reasonable number of jobs.
- 3
Deduct direct variable costs
List what rises when you serve one more customer. For a restaurant this may include ingredients, delivery-platform commission and card fees. For a photographer it could include second-shooter costs, travel and album production. For a salon, include products used and any commission or incremental staffing cost.
- 4
Measure repeat custom from cohorts
Look at customers who first bought in a specific month or quarter, then see how many bought again. Cohort tracking avoids confusing new sales with repeat sales. Use actual booking history, membership renewals, service reminders or invoices rather than an assumed retention percentage.
- 5
Subtract the true cost of acquisition
Include the share of paid advertising, lead-platform fees, promotional discounts, salesperson commission and any per-lead cost. If staff spend substantial time following up leads, estimate that cost consistently. Do not allocate every business overhead to one customer, but do not ignore customer-specific effort either.
- 6
Set a conservative usable number
Create three versions: first-sale contribution, expected value before acquisition, and value after acquisition. Use the most conservative figure that fits the decision. For example, a short-term cash decision may use first-sale contribution, while a retention programme can reasonably use a 12-month value.
Worked examples for different local businesses
Example: a dog grooming business with repeat bookings
A grooming business charges an average of £52 per appointment excluding VAT. Average variable costs are £13 per appointment for products, card fees and the directly attributable portion of appointment labour. That leaves £39 contribution per visit.
From booking history, a typical new customer books six visits per year and stays active for two years. To avoid assuming every forecast comes true, the owner applies a 15% reduction for missed appointments, churn and lower-value bookings.
| Contribution per appointment | £52 − £13 = £39 |
|---|---|
| Contribution before adjustment | £39 × 6 visits × 2 years = £468 |
| Conservative 24-month contribution | £468 × 85% = £397.80 |
| Customer acquisition cost | £40 |
| Estimated value after acquisition | £357.80 |
This does not mean the business should automatically pay £357.80 for every new customer. It still needs a contribution buffer for fixed costs, profit and risk. It does show why a business with reliable rebooking can sensibly invest more to win a suitable first-time client than a one-off service business can.
Example: a kitchen fitter with project-based sales
A kitchen fitting project has a sale value of £9,000 excluding VAT. Materials, subcontractors, skip hire, delivery and job-specific labour total £6,150. The first-project contribution is £2,850. The business does not normally receive repeat kitchen projects, so it should not invent repeat value. However, its properly recorded data shows that one in eight completed projects produces a referred project, and the average contribution from that referred project is £2,500.
Expected referral contribution = 12.5% × £2,500 = £312.50
Expected value before acquisition = £2,850 + £312.50 = £3,162.50
If a trusted lead source costs £420 per signed project and estimating time costs a further £80 per sale, the estimated value after acquisition is £2,662.50. Because the sales cycle is long and project margins vary, the owner should review this by project type and protect cash flow with a lower acquisition ceiling than the headline figure suggests.
When an extra customer is not automatically valuable
Capacity changes the maths. If your diary is full, an additional customer may require overtime, a new employee, extra equipment, a larger premises or the displacement of a better-margin job. In that situation, use this variation:
Incremental value = contribution from the new customer − extra capacity cost − contribution lost from the work displaced
A restaurant that fills an otherwise empty Tuesday table may gain almost all of the meal’s contribution. The same restaurant accepting a booking at a fully booked Saturday service may create little extra value if it forces a higher-margin booking away. The same principle applies to trades, appointment businesses and classes with limited places.
Use your result to set a marketing budget
Once you have a conservative customer-value number, decide how much contribution you want to retain after acquisition. The remainder is your maximum acquisition budget, not a target you must spend.
Maximum acquisition cost = conservative customer value − desired contribution retained after acquisition
For example, if the electrician’s conservative value after repeat work but before acquisition is £152.50, and the owner wants at least £90 left to support overheads and profit, the maximum acquisition cost is £62.50. A channel costing £35 per converted customer may be viable; a channel costing £90 needs a different explanation, such as a larger average job or better-quality customer.
Do
- Set a different acquisition ceiling for each service line.
- Compare cost per paying customer, not cost per enquiry.
- Use conservative assumptions until records justify higher values.
- Review results monthly and by lead source.
Do not
- Spend your full predicted lifetime value to win a customer.
- Use a high-margin flagship job to justify low-margin offers.
- Ignore cancellations, no-shows, refunds or credit losses.
- Assume a lead is profitable before it has converted and paid.
If you want a quick starting point before building your own spreadsheet, the Review Opportunity Calculator can help you frame the local opportunity. Treat its output as a planning estimate, then replace assumptions with the figures from your own records.
Where reviews fit into the value calculation
Reviews are not a fixed-price lead source and should not be credited with every sale that happens after a review arrives. They can, however, support a stronger local presence and give potential customers information when they compare businesses. Google says local results are mainly based on relevance, distance and prominence, and notes that more reviews and positive ratings can help local ranking; it does not offer a way to buy or request a better ranking. Read Google’s guidance on improving local ranking as a useful boundary rather than a ranking promise.
A practical way to value review activity is to measure its cost, run a consistent process, and compare the quality and volume of enquiries over time. Google Business Profile performance reporting can show views, searches and applicable customer interactions, although Google notes that its performance data can include activity from organic results and Google Ads. Use it alongside your enquiry log and completed-sales data rather than as proof that one action caused one sale. See Google’s explanation of Business Profile performance data for the measures available.
Measure reviews without making false assumptions
Track the process cost
Record staff time, messaging costs and any software cost used to make a genuine post-service request. Divide the monthly total by review requests or completed jobs, depending on the question you are answering.
Track commercial outcomes
Record lead source, service requested, quote value, conversion and contribution. Add a simple How did you hear about us? field and give staff consistent options, including Google, recommendation and returning customer.
Compare periods, not anecdotes
Compare like-for-like months, service areas and service lines where possible. Seasonality, staffing, pricing and advertising all affect results, so avoid assigning all change to review activity.
It is fine to ask customers for an honest review using a link or QR code. Google specifically permits requests through its review link or QR code, including in thank-you messages, but prohibits incentives in exchange for a review, edit or removal of a review. Google’s review-request guidance is clear that honest and balanced feedback matters.
Do not buy, reward or filter reviews
Do not offer discounts, gifts or entries into a prize draw in return for reviews. Do not send only happy customers to a public review site while diverting unhappy customers elsewhere. If you publish reviews or review information on your own website, the Competition and Markets Authority’s fake reviews guidance explains the need for proportionate measures to prevent and remove prohibited fake or misleading reviews. In regulated sectors, obtain sector-specific advice before using testimonials in marketing.
Build a simple customer-value tracker
You do not need complex finance software to start. A spreadsheet with one row per completed new customer is enough, provided everyone records information in the same way. Keep VAT, personal data and customer contact details appropriately separated from the analysis where possible.
Suggested monthly customer-value columns
Date won | Service line | Lead source | Revenue excluding VAT | Direct costs | First-sale contribution | Acquisition cost | Repeat sale within 12 months | Referral received | Review request sent | Review received | Notes
At month end, group the rows by service and lead source. Calculate average first-sale contribution, conversion rate from enquiry to paid customer, average acquisition cost and repeat contribution. Look for large differences before deciding that a channel is good or bad. Ten emergency call-outs and ten planned installations are unlikely to have the same economics.
Use a cautious attribution rule
For direct channels such as a paid directory or a tracked campaign, you may be able to assign acquisition cost reasonably clearly. For broader activity such as improved reviews, local visibility and word of mouth, use a contribution-to-growth view instead: monitor whether qualified enquiries, conversion and customer value improve after a sustained, compliant process is in place. That is more honest than claiming each review created a specific sale.
If review requests include promotions, cross-selling or other marketing content, check the wording, lawful basis and opt-out handling. The ICO’s direct marketing guidance explains that organisations must plan their data use, be clear with people and respect objections to direct marketing. Obtain professional advice for complicated campaigns or sensitive sectors.
A 30-day action plan
Build the first-sale calculation
Choose your three most common or most valuable customer types. Pull the last three to six months of completed jobs. Calculate average revenue excluding VAT and list direct costs for each type. Do not aim for perfect data; aim for a repeatable starting point.
Add lead-source and repeat data
Standardise lead-source choices in your booking system or spreadsheet. Review recent customers for repeat bookings and referrals. Ask staff to use the same source labels so that Google, word of mouth, paid advertising and returning customers are not all filed as other.
Set acquisition ceilings and run one test
Choose a conservative acquisition ceiling for one customer type. Test one channel or improvement at a time, with a fixed budget or time period. Measure paid customers and contribution, not just reach, clicks or enquiries.
Make review collection consistent
After a successful completed service, make one polite request for genuine feedback and reply constructively to reviews. The guide to collecting reviews explains how to make the request part of a dependable customer process. Continue logging commercial outcomes before deciding what the activity is worth.
Before you rely on the number
- Have you excluded VAT, discounts and meaningful refunds?
- Have you included the direct costs that rise with another job?
- Have you separated one-off work from repeatable services?
- Is any repeat or referral value based on records rather than hope?
- Have you allowed for capacity constraints and work displaced?
- Are you comparing acquisition cost with paid customers, not raw leads?
- Are review requests open to genuine customers without incentives or filtering?
- Will you revisit the figures after another month or quarter of data?
Make the number useful, then improve it
The value of one extra local customer is a working management number, not a promise. Begin with first-sale contribution, add only the repeat and referral value you can support, and keep a margin for risk, overheads and profit. Recalculate as prices, costs, capacity and customer behaviour change.
Once you can see that a compliant review process is commercially worthwhile but do not have the capacity to operate it consistently, a Fully Managed Review Flywheel can help turn the process into a routine. If you prefer to run it in-house, the DIY Review Flywheel Software is the more direct fit. In either case, keep measuring enquiries, completed customers and contribution rather than relying on review counts alone.
Frequently asked questions
What is the value of one extra local customer?
It is the expected contribution a new customer creates after direct service costs and the cost of acquiring them. A fuller calculation can include evidence-based repeat purchases and referrals.
Should I use revenue or profit to calculate customer value?
Use contribution rather than revenue. Start with sales excluding VAT, then deduct costs that increase when you serve that customer, such as materials, variable labour, payment fees and job-specific subcontractors.
How do I calculate customer lifetime value for a one-off trade business?
Use first-job contribution as the base. Add future value only where your records support it, such as repair work, servicing plans or reliably tracked referrals. Do not assume every customer will return.
Should marketing spend equal my customer lifetime value?
No. Keep a contribution buffer for overheads, profit, risk and cash flow. Your maximum acquisition cost should be lower than your conservative estimate of customer value.
How do I value repeat customers?
Calculate the average contribution from later purchases and multiply it by the proportion of customers who make those purchases within a defined period. Cohort data from bookings or invoices is more reliable than assumptions.
How should I include referrals in the calculation?
Track the source of every new customer. If your records show a known proportion of customers generate referred jobs, multiply that proportion by the average contribution from a referred job. Keep it separate from core value until the data is dependable.
What if my business is already fully booked?
Calculate incremental value after extra capacity costs and any contribution lost from displaced work. A new customer may require overtime, subcontractors or a new employee, so their value can be far lower than the headline sale.
Can I calculate the value of reviews from Google Business Profile data?
Not precisely from review count alone. Track the cost of your review process alongside enquiry source, conversion, completed sales and contribution over time. Reviews can support visibility and customer confidence, but they do not guarantee a fixed number of sales.
Can I offer an incentive for a Google review?
No. Google prohibits incentives, including discounts or free goods or services, in exchange for reviews, review changes or removal of negative reviews. Ask for honest feedback from genuine customers instead.
Sources and further reading
The guidance in this article was checked against the following current sources. Platforms, laws and interfaces can change, so confirm important details before acting.
- Tips to improve your local ranking on Google — Google Business Profile Help
- Understand your Business Profile performance and insights — Google Business Profile Help
- Tips to get more reviews — Google Business Profile Help
- Fake reviews: guidance for businesses — Competition and Markets Authority
- Direct marketing guidance — Information Commissioner’s Office
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